+@item --s2k-calibration @var{milliseconds}
+@opindex s2k-calibration
+Change the default calibration time to @var{milliseconds}. The given
+value is capped at 60 seconds; a value of 0 resets to the compiled-in
+default. This option is re-read on a SIGHUP (or @code{gpgconf
+--reload gpg-agent}) and the S2K count is then re-calibrated.
+